Amazing iPhone app lets you acoustically measure distances of up to 25 meters

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You can redeem them as follows:

1) On your iPhone/iPod/iPad, tap the App Store icon from the Home Screen.

2) Navigate to the New section on the Featured tab.

3) Scroll to the bottom of the list to locate and tap the Redeem button.

4) Enter the promo code and tap the Redeem button in the upper right.

5) Tap done on the Thank You screen, then tap the home button to return to the home screen.

6) After a second, you should see the my app installing. (If the promo code was not used before...)

7) If you like the app, please upvote